Owl21

I have a Hyperfire 24E in my Aero M5 (DPMS based) build, and it works flawlessly.

Thanks. That will be next.

I finally got some range time with the rifle. I was able to get about 50 rounds through it before I had to call it a day. So far, for the break in period, it runs fine. I had a few failures where the spent brass did not fully eject. I attribute these to not having the stock firmly in my shoulder. The accuracy is sub MOA, so far, when I do my part running FGMM 175 SMK. The only thing I cannot account for, is that the spent brass ejects about 2 to 3 feet forward and 20 degrees to the right. This does not change if suppressed. I am running a standard DPMS carbine buffer and a GL-Shock stock.

For anyone interested to know, the Givati Co USA adjustable gas block I received was slightly out of spec. The hole in which the gas tube fits was a few thousandths too small, likely from the QPQ coating. I fixed it by wrapping some 600 grit sandpaper around a drill bit and working it in the hole until it polished out to spec. Fortunately the rifle is finally finished, because I am tired of fixing things that shouldn't need to be fixed in the first place.

This particular gas block does not have a set screw for locking the adjusting screw. Whether or not that becomes a downfall remains to be seen.

http://www.aim-trax.com/Givati-Company-USA-750-Low-Profile-Adjustable-QPQ-Gas-Block_p_7748.html Adjustable. Steel. Set screws. Low Profile. Made in USA. Affordable.

Thanks 98, and everyone else who has contributed. At this point, it passes all of the safety checks, and it is polished to a higher sheen than a chrome bumper on a '69 Chevelle SS at Barrett Jackson's. So I am going to put a new gas block on when it arrives early next week and then go break it in and see how it runs.

Ok then. Run it wet it shall be. (and here I was thinking SAAMI specs meant something in the fit of factory ammo and chambers...silly me)

Less than 10, one that I owned (but never fired.) They all cycled fine. Is there a concensus that it is normal for new .308 AR's to have chambers so tight that mortaring is required to remove an unspent factory cartridge from the chamber? If so, I will stop messing with it and just shoot the piss out of it for a while.

Out of over 100 new AR rifles I have either handled, personally built, and/or owned, I have never had to mortar the rifle to get an unspent round to eject. Had I bought a new rifle and in the process of initial safety checks found that I had to mortar rounds, said gun would promptly be returned. I do not think that any manufacturer would knowingly allow a firearm in such a condition to leave the production line. Even if they would, I would not, especially when my name is on it.

Everything is new, never fired. The Nickel Boron bolt and carrier are pristine and polished, including the bolt face. I have been cycling the FGMM 175's through it. I now have about 200 cycles and either it is getting a little easier to cycle, I am getting accustomed to it, or I am building extra muscle. I am going to try to put some rounds down the barrel next week.

Whether or not this is true, back when I purchased my suppressor from them a few years ago, they were selling over 50,000 cans per year, out of a residential home! I didn't want to conduct my business over the internet, so went to the owner's home office to make the purchase and pick up the can once my form 4 came back. Back then he had a very large pile of suppressors stacked on the shelves waiting for form fours, and said half his garage was full. Now that he has a brick and mortar shop, I can only imagine how much product he must be pushing out the door.

Headspace checks out. It will cleanly chamber the GO gauge. NOGO will not chamber. 1. After the first round of polishing, the chamber is only a little better - One mortar attempt to eject instead of 3 - 5 attempts. 2. After the second round of polishing, the chamber is still tight, requiring the round to be mortared to be ejected. I am using a 308-AR Chamber Maid chamber brush, Flitz, and jeweler's polish. 3. I changed to a new Chamber brush and polished for a third time to no avail. In total, a brush was spinning inside the chamber for 25-30 minutes with all three polishings combined. The chamber needs more than polishing. 4. I chambered several other types of 308 ammo, and the FGMM 175 SMK factory ammo could be ejected without mortaring, but still took considerable effort on the charging handle to free the round. Maybe it will wear in with some firing? I don't know. Picture after second polish

So far, the dealer has not yet received a response back from BATFE. When I was there the other day, he showed me a printout of a PDF for one of their e-filed SBR's and it had the stamp on it (meaning the original document with the stamp on it was likely scanned by BATFE, and emailed as a PDF with the appoval.) He and several people in the shop were having the same debate about it as we are having here. Is this "copy" of the of the orignal document with stamp all that will ever be received, or will they eventually mail the original? At this point, I guess no one really knows.

That was from a Class III dealer, who was working to confirm.